extends Sprite

onready var global_v=get_tree().get_root().get_node("previewer")

func _ready():
    pass

func _process(delta):
    self.material.set("shader_param/iTime",global_v.iTime)
    self.material.set("shader_param/iFrame",global_v.iFrame)

func cov_scb(value):
    self.material.set("shader_param/COVERAGE",float(value))

func thick_scb(value):
    self.material.set("shader_param/THICKNESS",value)

func absb_scb(value):
    self.material.set("shader_param/ABSORPTION",float(value))
    
func step_scb(value):
    self.material.set("shader_param/STEPS",value)


export var sun_position = Vector3(0.0, 1.0, 0.0) setget set_sun_position, get_sun_position
func set_sun_position(new_position):
    sun_position = new_position
    if self.material:
        self.material.set_shader_param("sun_pos", sun_position)
#		_trigger_update_sky()
func get_sun_position():
    return sun_position
    
func set_time_of_day(hours, directional_light, horizontal_angle = 0.0):
    var sun_position = Vector3(0.0, -100.0, 0.0)
    sun_position = sun_position.rotated(Vector3(1.0, 0.0, 0.0), hours * PI / 12.0)
    sun_position = sun_position.rotated(Vector3(0.0, 1.0, 0.0), horizontal_angle)
    
    if directional_light:
        var t = directional_light.transform
        t.origin = sun_position
        directional_light.transform = t.looking_at(Vector3(0.0, 0.0, 0.0), Vector3(0.0, 1.0, 0.0))
        directional_light.light_energy = 1.0 - clamp(abs(hours - 12.0) / 6.0, 0.0, 1.0)
    
    # and update our sky
    set_sun_position(sun_position)